network: print Ethernet Link-Layer DHCP client ID with leading 0's
This is a small cosmetic change. Before: Offered DHCP leases: 192.168.0.183 (to 0:9:a7:36:bc:89) After: Offered DHCP leases: 192.168.0.183 (to 00:09:a7:36:bc:89) (cherry picked from commit 8e664ab6)
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